import java.io.IOException;
import java.util.*;
        
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
        
public class WordCount {
        
	 public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
	    private final static IntWritable one = new IntWritable(1);
	    private Text word = new Text();
	        
	    @Override
		public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
	        String line = value.toString();
	        StringTokenizer tokenizer = new StringTokenizer(line);
	        while (tokenizer.hasMoreTokens()) {
	            word.set(tokenizer.nextToken());
	            context.write(word, one);
	        }
	    }
	 } 
	        
	 public static class Reduce extends Reducer<Text, IntWritable, Text, IntWritable> {
	
	    @Override
		public void reduce(Text key, Iterable<IntWritable> values, Context context) 
	      throws IOException, InterruptedException {
	        int sum = 0;
	        for (IntWritable val : values) {
	            sum += val.get();
	        }
	        context.write(key, new IntWritable(sum));
	        System.out.println("Chave: " + key + " Quantidade: " + new IntWritable(sum));
	    }
	 }
	        
	 public static void main(String[] args) throws Exception {
	    Configuration conf = new Configuration();
	    Job job = new Job(conf, "wordcount");
	    
	    job.setOutputKeyClass(Text.class);
	    job.setOutputValueClass(IntWritable.class);
	        
	    job.setMapperClass(Map.class);
	    job.setReducerClass(Reduce.class);
	        
	    job.setInputFormatClass(TextInputFormat.class);
	    job.setOutputFormatClass(TextOutputFormat.class);
	    
	    String str = "D:/aew.txt";
	    String str2 = "D:/aewOut";
	        
	    FileInputFormat.addInputPath(job, new Path(str));
	    FileOutputFormat.setOutputPath(job, new Path(str2));
	        
	    job.waitForCompletion(true);
	 }
        
}